← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 223 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.89² =
  2. 2.59² =
  3. 3.44² =
  4. 4.41² =
  5. 5.61² =
  6. 6.47² =
  7. 7.92² =
  8. 8.77² =
  9. 9.78² =
  10. 10.51² =
  11. 11.88² =
  12. 12.45² =
  13. 13.63² =
  14. 14.54² =
  15. 15.96² =
  16. 16.76² =
  17. 17.98² =
  18. 18.31² =
  19. 19.36² =
  20. 20.48² =
  21. 21.67² =
  22. 22.81² =
  23. 23.73² =
  24. 24.46² =
  25. 25.94² =
  26. 26.79² =
  27. 27.99² =
  28. 28.84² =
  29. 29.42² =
  30. 30.87² =
  31. 31.34² =
  32. 32.83² =
  33. 33.62² =
  34. 34.57² =
  35. 35.68² =
  36. 36.33² =
  37. 37.93² =
  38. 38.91² =
  39. 39.49² =
  40. 40.35² =

Answer key

  1. 7921
  2. 3481
  3. 1936
  4. 1681
  5. 3721
  6. 2209
  7. 8464
  8. 5929
  9. 6084
  10. 2601
  11. 7744
  12. 2025
  13. 3969
  14. 2916
  15. 9216
  16. 5776
  17. 9604
  18. 961
  19. 1296
  20. 2304
  21. 4489
  22. 6561
  23. 5329
  24. 2116
  25. 8836
  26. 6241
  27. 9801
  28. 7056
  29. 1764
  30. 7569
  31. 1156
  32. 6889
  33. 3844
  34. 3249
  35. 4624
  36. 1089
  37. 8649
  38. 8281
  39. 2401
  40. 1225

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths